Reco wrote: > # apt install qttools5-dev-tools -y
tried several times without success - perhaps because qt4 was installed before. > $ /usr/lib/x86_64-linux-gnu/qt5/bin/qdbusviewer > > Works for me. you should try starting qdbusviewer not from the full path. Does it work? $ which qdbusviewer /usr/bin/qdbusviewer $ ls -al /usr/bin/qdbusviewer lrwxrwxrwx 1 root root 9 May 3 2019 /usr/bin/qdbusviewer -> qtchooser $ /usr/bin/qdbusviewer qdbusviewer: could not find a Qt installation of '' in the other terminal $ which qdbusviewer /opt/custom_x64/qt5.12/5.12.2/gcc_64/bin/qdbusviewer $ qdbusviewer Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString) A simple proof that after 11 years since they (KDE) promised things will work - it is still the same BS. regards